That one (Zigbee model) is also sold at https://www.aliexpress.com/item/1005007329498149.html
It is made by Tuya looks to be called Tuya Soil sensor _TZE284_aao3yzhs (TS0601 TZE284_aao3yzhs):
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Zigbee2MQTT (Z2M) developers already got it working → [New device support]: Soil sensor _TZE284_aao3yzhs · Issue #23455 · Koenkk/zigbee2mqtt · GitHub
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There seem to be no ZHA Device Handlers (quirks) for it as of yet → [Device Support Request] Plant Monitor SGS01Z · Issue #3305 · zigpy/zha-device-handlers · GitHub
From pictures it is a capacitive soil moisture sensor using TLC555 which I read is suppose to be good.
I have not bought it yet so not tested but the description sounds promising and the design seems nice, even if it might perhaps be a little basic feature-wise and maybe a little on the large size with it using two AAA-batteries but that should also make it have a long battery life (as long as you have enough Zigbee Router devices close to it for good reception).
The silicon cover on it look to have a very ugly blue color though, but perhaps they sell it in different colours or at least covers with other colors? not sure why they did not make the whole device all in white or better yet all in black to it does not stick out if used in an indoor flowerpot?
https://www.aliexpress.com/item/1005007329498149.html
Some posted these pictures in the review comments:
